I've always found the default movement keys to be quite intuitive and am happy with them (though I dislike that the center of orbit-rotation of the camera is the object selected, not the object being followed as in Celestia; makes it too easy to accidentally end up lightyears away by clicking on a background star). It would be nice to see some way of changing key assignments in the program for a future release, to better accommodate peoples' varying preferences. I think this is already on the to-do list? That would solve everyone's potential issues with the key configuration.

Can we change the speed of rotation, it always seems to rotate too fast for me, I would like to slow it down a lot.

That would be a nice feature. In the meantime however, you could always momentarily switch to spacecraft mode and use that for precision rotation, then switch back when you have it how you like it. Also useful for low framerates.

RAF Blackface: What I do to get around that (if your trying to take a level screenshot for example) is to switch to airplane or spaceship mode and tap q or e rotate it very slowly and then switch back to free mode when it looks right to you. Hopefully this will help